JP3851229B2 - Actuator suspension installation device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an actuator suspension erection apparatus for laying a plurality of linear suspensions for supporting an actuator movable portion composed of a lens holder that holds an objective lens so as to be displaceable with respect to a frame, and in particular, it is easy to lay a suspension In particular, the present invention relates to an actuator suspension erection apparatus which is performed with high accuracy.
[0002]
[Prior art]
An optical head that optically reads or writes signals on a signal recording medium such as a disk normally drives an objective lens in a housing in which a semiconductor laser that is a light emitting element and a photodetector that is a light receiving element are incorporated. It is configured by installing an actuator.
[0003]
In general, an actuator includes a moving coil such as a focusing coil and a tracking coil mounted on a lens holder that holds an objective lens to form an actuator movable portion, and the actuator movable portion is supported to be displaceable with respect to a housing. The magnetic circuit is arranged to effectively form a magnetic field.
[0004]
In an actuator, a configuration using a linear suspension such as a wire or a leaf spring to support an actuator movable part so as to be displaceable with respect to the housing is mainly used, and each end portion of a plurality of linear suspensions is respectively near The fixed member fixed to the housing and the actuator movable portion are fixed.
[0005]
[Problems to be solved by the invention]
By the way, when installing suspension wires when assembling the actuator, each suspension wire is first inserted into each hole formed in the fixed member, and then inserted into the hole of the support portion formed in the actuator movable portion. After that, a stopper for positioning the tip of the suspension wire is disposed in contact with the end of the coil wound around the lens holder and the terminal for soldering the suspension wire. When the terminal portion thus configured is wound around the end of the coil, the normal terminal portion is provided close to the positioning stopper, and the coil wound around the terminal portion generates a gap between the suspension wires. When soldering, the suspension wire may be biased to the coil side and soldered, and there is a problem that the lens tilts during driving.
[0006]
[Means for Solving the Problems]
In the present invention, suspension wires are inserted into support portions forming a plurality of holes formed in the actuator movable portion from a plurality of holes provided in a fixing member fixed to the frame, and fixed at these support portions, and Protruding terminal part that connects suspension wire and coil ends at the insertion destination and a stopper member that positions the tip of each suspension wire are provided at the tip, and the tip of the terminal part is tilted toward the support part and molded did.
[0007]
【Example】
FIG. 1 is a perspective view showing an assembled state of a suspension erection device for an actuator of an optical head according to the present invention, and FIG. 2 is a perspective view showing a state of a main part in which a magnetic circuit portion of the actuator of FIG. 1 is omitted.
[0008]
The objective lens 1 is held by a lens holder 2. A focus coil 3 is attached to the entire circumference of the side surface of the lens holder 2, and tracking coils 4 are attached to both sides of each predetermined side surface of the lens holder 2. ing.
[0009]
Further, on both sides of the objective lens 1 of the lens holder 2, one end of a linear suspension wire 5 serving as an elastic support is vertically supported by the support portion 6 that supports the through portion 6 a, the focus coil 3, and the tracking coil 4. A terminal portion 7 for connecting the winding end of the wire to the suspension wire 5 is formed so as to protrude and the terminal portion 7 is inclined toward the support portion so that the coil can be easily wound as shown in FIG. Are molded.
[0010]
Then, a stopper 8 is formed integrally with the lens holder 2 adjacent to the terminal portion 7, and the end portion of the suspension wire 5 is positioned.
[0011]
Further, the other end of each of the four suspension wires 5 has a fixing hole 11 provided in a fixing member 10 attached to an end portion of a frame 9 made of a magnetic material so as to include a magnetic circuit portion acting as a yoke described later. And fixed to the frame 9 with screws 12.
[0012]
The pair of magnets 13 and 14 are disposed so that the same magnetic pole surface (N pole) faces each other with the lens holder 2 interposed therebetween. The magnetic pole surfaces of the S poles of the magnets 13 and 14 are respectively provided with external yokes 15 and 16 formed integrally with the frame 9. The magnetic pole surfaces of the N poles of the magnets 13 and 14 are respectively attached to the frame 9. Counter yokes 17 and 18 formed integrally with each other are arranged to face each other.
[0013]
The magnetic flux generated from the magnets 13 and 14 acts on the effective area of the focus coil 3 and each tracking coil 4 and supplies a focus error signal to the focus coil 3 to focus the light beam on the signal surface of the disk. The lens holder 2 is driven so that the objective lens 1 is driven together with the lens holder 2 so that the control is performed, and a tracking error signal is supplied to each tracking coil 4 so as to follow the light beam to the signal track of the disk. At the same time, the objective lens 1 is driven.
[0014]
Next, the assembly of the present invention in the thus configured objective lens driving device will be described in more detail with reference to FIGS.
[0015]
The lens holder 2 has a rectangular box shape with an open bottom, and is formed of a liquid crystal polymer material, and each mounting portion to which each support portion 6, terminal portion 7, stopper 8, focus coil 3 and each tracking coil 4 are mounted. Are formed integrally, and when the terminal portion 7 is wound around the end portions of the focus coil 3 and each tracking coil 4, the tip end of the terminal portion 7 is directed toward the support portion 6 as shown in FIG. Since it is formed at an angle, it can be easily wound without being affected by the stopper 8.
[0016]
As for the assembly of the actuator movable part, the suspension wire 5 is positioned by the stopper 8 after passing through the fixing hole 11 using the assembly jig, further passing through the penetration part 6a and contacting the terminal part 7. The through portion 6a and the fixing hole 11 are bonded around the suspension wire 5 by soldering. The actuator is assembled by soldering the suspension wire 5 to the terminal portion 7 around which the end portions of the focus coil 3 and the tracking coils 4 are wound.
Accordingly, the lens holder 2 is elastically supported by the four suspension wires 5 so as to be displaceable on the frame 9.
[0017]
【The invention's effect】
As described above, according to the present invention, the suspension wires are respectively inserted into the support portions forming the plurality of holes formed in the actuator movable portion from the plurality of holes provided in the fixing member fixed to the frame, Protruding terminal portions that are fixed by these supporting portions and that connect the suspension wire and the end of the coil at the insertion destination and a stopper member that positions the tip of each suspension wire are provided at the tip of the terminal portion, Since the tip is tilted in the direction of the support part, the end of the coil can be wound around the position where the suspension wire is placed, so the suspension wire and the end of the coil can be easily soldered without stress. can do.
[0018]
Even if the terminal portion is adjacent to the stopper, the leading end of the terminal portion to be wound is in a direction extending from the stopper, so that the lead wire of the focus coil and tracking coil can be easily wound around the terminal portion.
[0019]
In addition, since the stopper member is provided, the suspension can be constructed with high accuracy without the need for a positioning jig at the distal end where each suspension wire is inserted. Then, the end portions of the suspensions are set to predetermined positions with a constant positional relationship, and the suspensions can be easily installed.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an assembled state of a suspension laying device for an actuator of an optical head according to the present invention.
2 is a perspective view showing a state of a main part in which a magnetic circuit portion of the actuator of FIG. 1 is omitted. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Objective lens 2 Lens holder 5 Suspension wire 6 Support part 6a Penetration part 7 Terminal part 8 Stopper 9 Frame 10 Fixing member 11 Fixing hole

Claims (1)

An actuator suspension erection device for laying a plurality of linear suspensions for supporting an actuator movable portion including a lens holder for holding an objective lens so as to be displaceable with respect to the frame, and is provided on a fixing member fixed to the frame. Suspension wires are inserted into the support parts that form the multiple holes formed in the actuator movable part from the multiple holes, fixed at these support parts, and the suspension wire and the end of the coil are connected to the insertion destination Suspension erection device for an actuator, characterized in that a projecting terminal part and a stopper member for positioning the tip of each suspension wire are provided at the tip of the terminal part, and the tip of the terminal part is formed to be inclined toward the support part. .

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